H3C Technologies H3C S6300 Series Switches - Manual (Page 46)

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The rate limit of a physical interface specifies the maximum rate for sending or receiving packets
(including critical packets).
Rate limit also uses token buckets for traffic control. When rate limit is configured on an interface, a token
bucket handles all packets to be sent through the interface for rate limiting. If enough tokens are in the
token bucket, packets can be forwarded. Otherwise, packets are put into QoS queues for congestion
management. In this way, the traffic passing the physical interface is controlled.
Figure 10 Rate limit implementation
The token bucket mechanism limits traffic rate when accommodating bursts. It allows bursty traffic to be
transmitted if enough tokens are available. If tokens are scarce, packets cannot be transmitted until
efficient tokens are generated in the token bucket. It restricts the traffic rate to the rate for generating
tokens.
Rate limit controls the total rate of all packets on a physical interface. It is easier to use than traffic policing
in controlling the total traffic rate on a physical interface.
Configuring traffic policing
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a traffic class
and enter traffic class
view.
traffic classifier classifier-name
[ operator { and | or } ]
By default, no traffic class exists.
3. Configure match
criteria.
if-match match-criteria
By default, no match criterion is
configured.
For more information about the
if-match command, see ACL and QoS
Command Reference.
4. Return to system view. quit N/A
5. Create a traffic
behavior and enter
traffic behavior view.
traffic behavior behavior-name By default, no traffic behavior exists.